怎样启动JDBC Debug模式，打印JDBC诊断日志

1.下载Debug版本号jar包
首先要下载一个Debug版本号的JDBC jar包，Debug版本号的jar包命名形式为jdbcX_g.jar（例如以下图所看到的）。如Oracle11g的Debug版本号的jar包为jdbc6_g.jar。

点击这里下载：http://www.oracle.com/technetwork/database/enterprise-edition/jdbc-112010-090769.html

2.启动Logging模式
第一种方式：设置执行环境变量java -Doracle.jdbc.Trace=true ...（elipse中run->run configurations->arguments一栏）
另外一种方式：在程序中控制（建议採用这样的方式）

MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
String loader = Thread.currentThread().getContextClassLoader().toString().replaceAll("[,=:\"]+", "");
ObjectName pattern = new ObjectName("com.oracle.jdbc:type=diagnosability,name=" + loader);
ObjectName diag = ((ObjectName[]) (mbs.queryNames(pattern, null).toArray(new ObjectName[0])))[0];
mbs.setAttribute(diag, new Attribute("LoggingEnabled", true));
System.out.println("LoggingEnabled = " + mbs.getAttribute(diag, "LoggingEnabled"));

假设用的是Oracle 10g,直接运行：

/**oracle 10g 启动方法*/
oracle.jdbc.driver.OracleLog.setTrace(true); // enable logging
oracle.jdbc.driver.OracleLog.setTrace(false); // disable logging

3.配置log文件
jdbc使用的是java.util.logging包中的Logger对象打印log。

/**配置log文件*/
Handler fh = new FileHandler("./oracle_jdbc_log.log");
fh.setLevel(Level.ALL);
fh.setFormatter(new SimpleFormatter());
Logger.getLogger("").addHandler(fh);
Logger.getLogger("").setLevel(Level.ALL);

4.以下给大家一个完毕的Demo

import javax.management.Attribute;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.InvalidAttributeValueException;
import javax.management.MBeanException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;

public void run() throws SQLException {
DriverManager.registerDriver(new OracleDriver());
//需在载入OracleDriver之后开启log
enableOracleLogging();
Connection conn = null;
Statement stmt = null;
ResultSet rset = null;
try {
conn = getConnection();
System.out.println("Connection retrieved..");
stmt = conn.createStatement();
rset = stmt.executeQuery("select empno from emp");
while (rset.next()) {
System.out.println(rset.getInt(1));
}
} catch (SQLException sqle) {
sqle.printStackTrace();
} finally {
if (rset != null) {
rset.close();
}
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
}
}
public static void enableOracleLogging() {
try {
/** 配置log文件 */
Handler fh = new FileHandler("./oracle_jdbc_log.log");
fh.setLevel(Level.ALL);
fh.setFormatter(new SimpleFormatter());
Logger.getLogger("").addHandler(fh);
Logger.getLogger("").setLevel(Level.ALL);
/** oracle 11g 启动方法 */
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
String loader = Thread.currentThread().getContextClassLoader().toString().replaceAll("[,=:\"]+", "");
ObjectName pattern = new ObjectName("com.oracle.jdbc:type=diagnosability,name=" + loader);
ObjectName diag = ((ObjectName[]) (mbs.queryNames(pattern, null).toArray(new ObjectName[0])))[0];
mbs.setAttribute(diag, new Attribute("LoggingEnabled", true));
System.out.println("LoggingEnabled = " + mbs.getAttribute(diag, "LoggingEnabled"));/** oracle 10g 启动方法 */
// oracle.jdbc.driver.OracleLog.setTrace(true); // enable logging
// oracle.jdbc.driver.OracleLog.setTrace(false); // disable logging

} catch (Exception e) {
e.printStackTrace();
}
}